1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "mesh_upper_transport.c" 39 40 #include "mesh/mesh_upper_transport.h" 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "btstack_util.h" 47 #include "btstack_memory.h" 48 #include "btstack_debug.h" 49 50 #include "mesh/beacon.h" 51 #include "mesh/mesh_iv_index_seq_number.h" 52 #include "mesh/mesh_keys.h" 53 #include "mesh/mesh_lower_transport.h" 54 #include "mesh/mesh_peer.h" 55 #include "mesh/mesh_virtual_addresses.h" 56 57 // TODO: extract mesh_pdu functions into lower transport or network 58 #include "mesh/mesh_access.h" 59 60 // combined key x address iterator for upper transport decryption 61 62 typedef struct { 63 // state 64 mesh_transport_key_iterator_t key_it; 65 mesh_virtual_address_iterator_t address_it; 66 // elements 67 const mesh_transport_key_t * key; 68 const mesh_virtual_address_t * address; 69 // address - might be virtual 70 uint16_t dst; 71 // key info 72 } mesh_transport_key_and_virtual_address_iterator_t; 73 74 static void mesh_upper_transport_validate_segmented_message(void); 75 static void mesh_upper_transport_run(void); 76 77 static int crypto_active; 78 79 static mesh_unsegmented_pdu_t * incoming_unsegmented_pdu_raw; 80 81 static mesh_segmented_pdu_t incoming_message_pdu_singleton; 82 83 static mesh_access_pdu_t * incoming_access_pdu_encrypted; 84 static mesh_access_pdu_t * incoming_access_pdu_decrypted; 85 86 static mesh_access_pdu_t incoming_access_pdu_encrypted_singleton; 87 static mesh_access_pdu_t incoming_access_pdu_decrypted_singleton; 88 89 static mesh_segmented_pdu_t outgoing_segmented_message_singleton; 90 static mesh_transport_pdu_t * outgoing_segmented_pdu; 91 92 static mesh_unsegmented_pdu_t outgoing_unsegmented_pdu; 93 94 static uint8_t application_nonce[13]; 95 static btstack_crypto_ccm_t ccm; 96 static mesh_transport_key_and_virtual_address_iterator_t mesh_transport_key_it; 97 98 // upper transport callbacks - in access layer 99 static void (*mesh_access_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 100 static void (*mesh_control_message_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 101 static void (*higher_layer_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); 102 103 // incoming unsegmented (network) and segmented (transport) control and access messages 104 static btstack_linked_list_t upper_transport_incoming; 105 106 // outgoing unsegmented (network) and segmented (uppert_transport_outgoing) control and access messages 107 static btstack_linked_list_t upper_transport_outgoing; 108 109 110 // TODO: higher layer define used for assert 111 #define MESH_ACCESS_OPCODE_NOT_SET 0xFFFFFFFEu 112 113 void mesh_upper_transport_send_access_pdu(mesh_pdu_t *pdu){ 114 switch (pdu->pdu_type){ 115 case MESH_PDU_TYPE_UNSEGMENTED: 116 case MESH_PDU_TYPE_TRANSPORT: 117 break; 118 default: 119 btstack_assert(false); 120 break; 121 } 122 123 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 124 mesh_upper_transport_run(); 125 } 126 127 void mesh_upper_transport_send_control_pdu(mesh_pdu_t * pdu){ 128 if (pdu->pdu_type == MESH_PDU_TYPE_NETWORK){ 129 btstack_assert( ((mesh_network_pdu_t *) pdu)->len >= 9); 130 } 131 132 btstack_linked_list_add_tail(&upper_transport_outgoing, (btstack_linked_item_t*) pdu); 133 mesh_upper_transport_run(); 134 } 135 136 static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ 137 printf("%-20s ", name); 138 printf_hexdump(data, len); 139 } 140 // static void mesh_print_x(const char * name, uint32_t value){ 141 // printf("%20s: 0x%x", name, (int) value); 142 // } 143 144 static void mesh_transport_key_and_virtual_address_iterator_init(mesh_transport_key_and_virtual_address_iterator_t *it, 145 uint16_t dst, uint16_t netkey_index, uint8_t akf, 146 uint8_t aid) { 147 printf("KEY_INIT: dst %04x, akf %x, aid %x\n", dst, akf, aid); 148 // config 149 it->dst = dst; 150 // init elements 151 it->key = NULL; 152 it->address = NULL; 153 // init element iterators 154 mesh_transport_key_aid_iterator_init(&it->key_it, netkey_index, akf, aid); 155 // init address iterator 156 if (mesh_network_address_virtual(it->dst)){ 157 mesh_virtual_address_iterator_init(&it->address_it, dst); 158 // get first key 159 if (mesh_transport_key_aid_iterator_has_more(&it->key_it)) { 160 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 161 } 162 } 163 } 164 165 // cartesian product: keys x addressses 166 static int mesh_transport_key_and_virtual_address_iterator_has_more(mesh_transport_key_and_virtual_address_iterator_t * it){ 167 if (mesh_network_address_virtual(it->dst)) { 168 // find next valid entry 169 while (true){ 170 if (mesh_virtual_address_iterator_has_more(&it->address_it)) return 1; 171 if (!mesh_transport_key_aid_iterator_has_more(&it->key_it)) return 0; 172 // get next key 173 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 174 mesh_virtual_address_iterator_init(&it->address_it, it->dst); 175 } 176 } else { 177 return mesh_transport_key_aid_iterator_has_more(&it->key_it); 178 } 179 } 180 181 static void mesh_transport_key_and_virtual_address_iterator_next(mesh_transport_key_and_virtual_address_iterator_t * it){ 182 if (mesh_network_address_virtual(it->dst)) { 183 it->address = mesh_virtual_address_iterator_get_next(&it->address_it); 184 } else { 185 it->key = mesh_transport_key_aid_iterator_get_next(&it->key_it); 186 } 187 } 188 189 // UPPER TRANSPORT 190 191 static uint16_t mesh_access_dst(mesh_access_pdu_t * access_pdu){ 192 return big_endian_read_16(access_pdu->network_header, 7); 193 } 194 195 uint16_t mesh_access_ctl(mesh_access_pdu_t * access_pdu){ 196 return access_pdu->network_header[1] >> 7; 197 } 198 199 200 // stub lower transport 201 202 static void mesh_upper_transport_dump_pdus(const char *name, btstack_linked_list_t *list){ 203 printf("List: %s:\n", name); 204 btstack_linked_list_iterator_t it; 205 btstack_linked_list_iterator_init(&it, list); 206 while (btstack_linked_list_iterator_has_next(&it)){ 207 mesh_pdu_t * pdu = (mesh_pdu_t*) btstack_linked_list_iterator_next(&it); 208 printf("- %p\n", pdu); 209 // printf_hexdump( mesh_pdu_data(pdu), mesh_pdu_len(pdu)); 210 } 211 } 212 213 static void mesh_upper_transport_reset_pdus(btstack_linked_list_t *list){ 214 while (!btstack_linked_list_empty(list)){ 215 mesh_upper_transport_pdu_free((mesh_pdu_t *) btstack_linked_list_pop(list)); 216 } 217 } 218 219 void mesh_upper_transport_dump(void){ 220 printf("incoming_unsegmented_pdu_raw: %p\n", incoming_unsegmented_pdu_raw); 221 mesh_upper_transport_dump_pdus("upper_transport_incoming", &upper_transport_incoming); 222 } 223 224 void mesh_upper_transport_reset(void){ 225 crypto_active = 0; 226 if (incoming_unsegmented_pdu_raw){ 227 mesh_network_pdu_t * network_pdu = incoming_unsegmented_pdu_raw->segment; 228 btstack_assert(network_pdu != NULL); 229 incoming_unsegmented_pdu_raw->segment = NULL; 230 mesh_network_pdu_free(network_pdu); 231 incoming_unsegmented_pdu_raw = NULL; 232 } 233 if (outgoing_segmented_pdu != NULL){ 234 mesh_transport_pdu_free(outgoing_segmented_pdu); 235 outgoing_segmented_pdu = NULL; 236 } 237 mesh_upper_transport_reset_pdus(&upper_transport_incoming); 238 } 239 240 static uint32_t iv_index_for_ivi_nid(uint8_t ivi_nid){ 241 // get IV Index and IVI 242 uint32_t iv_index = mesh_get_iv_index(); 243 int ivi = ivi_nid >> 7; 244 245 // if least significant bit differs, use previous IV Index 246 if ((iv_index & 1 ) ^ ivi){ 247 iv_index--; 248 } 249 return iv_index; 250 } 251 252 static void transport_unsegmented_setup_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 253 nonce[1] = 0x00; // SZMIC if a Segmented Access message or 0 for all other message formats 254 (void)memcpy(&nonce[2], &network_pdu->data[2], 7); 255 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(network_pdu->data[0])); 256 } 257 258 static void transport_segmented_setup_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 259 mesh_transport_pdu_t * transport_pdu; 260 mesh_access_pdu_t * access_pdu; 261 switch (pdu->pdu_type){ 262 case MESH_PDU_TYPE_TRANSPORT: 263 transport_pdu = (mesh_transport_pdu_t *) pdu; 264 nonce[1] = transport_pdu->transmic_len == 8 ? 0x80 : 0x00; 265 (void)memcpy(&nonce[2], &transport_pdu->network_header[2], 7); 266 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(transport_pdu->network_header[0])); 267 break; 268 case MESH_PDU_TYPE_ACCESS: 269 access_pdu = (mesh_access_pdu_t *) pdu; 270 nonce[1] = access_pdu->transmic_len == 8 ? 0x80 : 0x00; 271 (void)memcpy(&nonce[2], &access_pdu->network_header[2], 7); 272 big_endian_store_32(nonce, 9, iv_index_for_ivi_nid(access_pdu->network_header[0])); 273 break; 274 default: 275 btstack_assert(0); 276 break; 277 } 278 } 279 280 static void transport_unsegmented_setup_application_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 281 nonce[0] = 0x01; 282 transport_unsegmented_setup_nonce(nonce, network_pdu); 283 mesh_print_hex("AppNonce", nonce, 13); 284 } 285 286 static void transport_unsegmented_setup_device_nonce(uint8_t * nonce, const mesh_network_pdu_t * network_pdu){ 287 nonce[0] = 0x02; 288 transport_unsegmented_setup_nonce(nonce, network_pdu); 289 mesh_print_hex("DeviceNonce", nonce, 13); 290 } 291 292 static void transport_segmented_setup_application_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 293 nonce[0] = 0x01; 294 transport_segmented_setup_nonce(nonce, pdu); 295 mesh_print_hex("AppNonce", nonce, 13); 296 } 297 298 static void transport_segmented_setup_device_nonce(uint8_t * nonce, const mesh_pdu_t * pdu){ 299 nonce[0] = 0x02; 300 transport_segmented_setup_nonce(nonce, pdu); 301 mesh_print_hex("DeviceNonce", nonce, 13); 302 } 303 304 static void mesh_upper_unsegmented_control_message_received(mesh_unsegmented_pdu_t * unsegmented_incoming_pdu){ 305 if (mesh_control_message_handler){ 306 mesh_control_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t*) unsegmented_incoming_pdu); 307 } else { 308 mesh_network_pdu_t * network_pdu =unsegmented_incoming_pdu->segment; 309 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 310 uint8_t opcode = lower_transport_pdu[0]; 311 printf("[!] Unhandled Control message with opcode %02x\n", opcode); 312 // done 313 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t*) unsegmented_incoming_pdu); 314 } 315 } 316 317 static void mesh_upper_transport_process_message_done(mesh_segmented_pdu_t *message_pdu){ 318 crypto_active = 0; 319 btstack_assert(message_pdu == &incoming_message_pdu_singleton); 320 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&incoming_message_pdu_singleton.segments); 321 if (mesh_network_control(network_pdu)) { 322 btstack_assert(0); 323 } else { 324 btstack_assert(network_pdu != NULL); 325 mesh_network_pdu_free(network_pdu); 326 mesh_pdu_t * pdu = (mesh_pdu_t *) incoming_unsegmented_pdu_raw; 327 incoming_unsegmented_pdu_raw = NULL; 328 mesh_lower_transport_message_processed_by_higher_layer(pdu); 329 } 330 mesh_upper_transport_run(); 331 } 332 333 static void mesh_upper_transport_process_unsegmented_message_done(mesh_pdu_t * pdu){ 334 btstack_assert(pdu != NULL); 335 btstack_assert(pdu->pdu_type == MESH_PDU_TYPE_UNSEGMENTED); 336 337 mesh_unsegmented_pdu_t * unsegmented_incoming_pdu = (mesh_unsegmented_pdu_t *) pdu; 338 btstack_assert(unsegmented_incoming_pdu == incoming_unsegmented_pdu_raw); 339 340 crypto_active = 0; 341 incoming_unsegmented_pdu_raw = NULL; 342 mesh_network_pdu_t * network_pdu = unsegmented_incoming_pdu->segment; 343 if (!mesh_network_control(network_pdu)) { 344 mesh_network_pdu_free(network_pdu); 345 } 346 347 mesh_lower_transport_message_processed_by_higher_layer(pdu); 348 mesh_upper_transport_run(); 349 } 350 351 static void mesh_upper_transport_process_segmented_access_message_done(mesh_access_pdu_t *access_pdu){ 352 crypto_active = 0; 353 btstack_assert(mesh_access_ctl(access_pdu) == 0); 354 incoming_access_pdu_encrypted = NULL; 355 mesh_upper_transport_run(); 356 } 357 358 static void mesh_upper_transport_validate_segmented_message_ccm(void * arg){ 359 UNUSED(arg); 360 361 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 362 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 363 364 mesh_print_hex("Decrypted PDU", upper_transport_pdu, upper_transport_pdu_len); 365 366 // store TransMIC 367 uint8_t trans_mic[8]; 368 btstack_crypto_ccm_get_authentication_value(&ccm, trans_mic); 369 mesh_print_hex("TransMIC", trans_mic, incoming_access_pdu_decrypted->transmic_len); 370 371 if (memcmp(trans_mic, &upper_transport_pdu[upper_transport_pdu_len], incoming_access_pdu_decrypted->transmic_len) == 0){ 372 printf("TransMIC matches\n"); 373 374 // remove TransMIC from payload 375 incoming_access_pdu_decrypted->len -= incoming_access_pdu_decrypted->transmic_len; 376 377 // if virtual address, update dst to pseudo_dst 378 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 379 big_endian_store_16(incoming_access_pdu_decrypted->network_header, 7, mesh_transport_key_it.address->pseudo_dst); 380 } 381 382 // pass to upper layer 383 btstack_assert(mesh_access_message_handler != NULL); 384 mesh_pdu_t * pdu = (mesh_pdu_t*) incoming_access_pdu_decrypted; 385 mesh_access_message_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, pdu); 386 387 printf("\n"); 388 389 } else { 390 uint8_t akf = incoming_access_pdu_decrypted->akf_aid_control & 0x40; 391 if (akf){ 392 printf("TransMIC does not match, try next key\n"); 393 mesh_upper_transport_validate_segmented_message(); 394 } else { 395 printf("TransMIC does not match device key, done\n"); 396 // done 397 mesh_upper_transport_process_segmented_access_message_done(incoming_access_pdu_decrypted); 398 } 399 } 400 } 401 402 static void mesh_upper_transport_validate_segmented_message_digest(void * arg){ 403 UNUSED(arg); 404 uint8_t upper_transport_pdu_len = incoming_access_pdu_encrypted->len - incoming_access_pdu_encrypted->transmic_len; 405 uint8_t * upper_transport_pdu_data_in = incoming_access_pdu_encrypted->data; 406 uint8_t * upper_transport_pdu_data_out = incoming_access_pdu_decrypted->data; 407 btstack_crypto_ccm_decrypt_block(&ccm, upper_transport_pdu_len, upper_transport_pdu_data_in, upper_transport_pdu_data_out, &mesh_upper_transport_validate_segmented_message_ccm, NULL); 408 } 409 410 static void mesh_upper_transport_validate_segmented_message(void){ 411 uint8_t * upper_transport_pdu_data = incoming_access_pdu_decrypted->data; 412 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 413 414 if (!mesh_transport_key_and_virtual_address_iterator_has_more(&mesh_transport_key_it)){ 415 printf("No valid transport key found\n"); 416 mesh_upper_transport_process_segmented_access_message_done(incoming_access_pdu_decrypted); 417 return; 418 } 419 mesh_transport_key_and_virtual_address_iterator_next(&mesh_transport_key_it); 420 const mesh_transport_key_t * message_key = mesh_transport_key_it.key; 421 422 if (message_key->akf){ 423 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 424 } else { 425 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) incoming_access_pdu_encrypted); 426 } 427 428 // store application / device key index 429 mesh_print_hex("AppOrDevKey", message_key->key, 16); 430 incoming_access_pdu_decrypted->appkey_index = message_key->appkey_index; 431 432 mesh_print_hex("EncAccessPayload", upper_transport_pdu_data, upper_transport_pdu_len); 433 434 // decrypt ccm 435 crypto_active = 1; 436 uint16_t aad_len = 0; 437 if (mesh_network_address_virtual(mesh_access_dst(incoming_access_pdu_decrypted))){ 438 aad_len = 16; 439 } 440 btstack_crypto_ccm_init(&ccm, message_key->key, application_nonce, upper_transport_pdu_len, aad_len, incoming_access_pdu_decrypted->transmic_len); 441 442 if (aad_len){ 443 btstack_crypto_ccm_digest(&ccm, (uint8_t *) mesh_transport_key_it.address->label_uuid, aad_len, &mesh_upper_transport_validate_segmented_message_digest, NULL); 444 } else { 445 mesh_upper_transport_validate_segmented_message_digest(NULL); 446 } 447 } 448 449 static void mesh_upper_transport_process_segmented_message(void){ 450 // copy original pdu 451 (void)memcpy(incoming_access_pdu_decrypted, incoming_access_pdu_encrypted, 452 sizeof(mesh_transport_pdu_t)); 453 454 // 455 uint8_t * upper_transport_pdu = incoming_access_pdu_decrypted->data; 456 uint8_t upper_transport_pdu_len = incoming_access_pdu_decrypted->len - incoming_access_pdu_decrypted->transmic_len; 457 mesh_print_hex("Upper Transport pdu", upper_transport_pdu, upper_transport_pdu_len); 458 459 uint8_t aid = incoming_access_pdu_decrypted->akf_aid_control & 0x3f; 460 uint8_t akf = (incoming_access_pdu_decrypted->akf_aid_control & 0x40) >> 6; 461 462 printf("AKF: %u\n", akf); 463 printf("AID: %02x\n", aid); 464 465 mesh_transport_key_and_virtual_address_iterator_init(&mesh_transport_key_it, mesh_access_dst(incoming_access_pdu_decrypted), 466 incoming_access_pdu_decrypted->netkey_index, akf, aid); 467 mesh_upper_transport_validate_segmented_message(); 468 } 469 470 static void mesh_upper_transport_message_received(mesh_pdu_t * pdu){ 471 btstack_linked_list_add_tail(&upper_transport_incoming, (btstack_linked_item_t*) pdu); 472 mesh_upper_transport_run(); 473 } 474 475 static void mesh_upper_transport_send_unsegmented_access_pdu_ccm(void * arg){ 476 crypto_active = 0; 477 478 mesh_unsegmented_pdu_t * unsegmented_pdu = (mesh_unsegmented_pdu_t *) arg; 479 mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; 480 481 uint8_t * upper_transport_pdu = mesh_network_pdu_data(network_pdu) + 1; 482 uint8_t upper_transport_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 483 mesh_print_hex("EncAccessPayload", upper_transport_pdu, upper_transport_pdu_len); 484 // store TransMIC 485 btstack_crypto_ccm_get_authentication_value(&ccm, &upper_transport_pdu[upper_transport_pdu_len]); 486 mesh_print_hex("TransMIC", &upper_transport_pdu[upper_transport_pdu_len], 4); 487 network_pdu->len += 4; 488 upper_transport_pdu_len += 4; 489 mesh_print_hex("UpperTransportPDU", upper_transport_pdu, upper_transport_pdu_len); 490 // send network pdu 491 mesh_lower_transport_send_pdu((mesh_pdu_t*) unsegmented_pdu); 492 } 493 494 static void mesh_upper_transport_send_segmented_pdu(mesh_transport_pdu_t * transport_pdu){ 495 outgoing_segmented_pdu = transport_pdu; 496 mesh_segmented_pdu_t * message_pdu = &outgoing_segmented_message_singleton; 497 message_pdu->pdu_header.pdu_type = MESH_PDU_TYPE_SEGMENTED; 498 499 // convert mesh_transport_pdu_t into mesh_segmented_pdu_t 500 uint16_t message_offset = 0; 501 uint16_t bytes_current_segment = 0; 502 mesh_network_pdu_t * network_pdu = NULL; 503 while (message_offset < transport_pdu->len){ 504 if (bytes_current_segment == 0){ 505 network_pdu = mesh_network_pdu_get(); 506 btstack_assert(network_pdu != NULL); 507 btstack_linked_list_add_tail(&message_pdu->segments, (btstack_linked_item_t *) network_pdu); 508 bytes_current_segment = MESH_NETWORK_PAYLOAD_MAX; 509 } 510 uint16_t bytes_to_copy = btstack_max(bytes_current_segment, transport_pdu->len - message_offset); 511 (void) memcpy(&network_pdu->data[network_pdu->len], &transport_pdu->data[message_offset], bytes_to_copy); 512 bytes_current_segment -= bytes_to_copy; 513 network_pdu->len += bytes_to_copy; 514 message_offset += bytes_to_copy; 515 } 516 // copy meta 517 message_pdu->len = transport_pdu->len; 518 message_pdu->netkey_index = transport_pdu->netkey_index; 519 message_pdu->transmic_len = transport_pdu->transmic_len; 520 message_pdu->akf_aid_control = transport_pdu->akf_aid_control; 521 message_pdu->flags = transport_pdu->flags; 522 (void)memcpy(message_pdu->network_header, transport_pdu->network_header, 9); 523 524 mesh_lower_transport_send_pdu((mesh_pdu_t*) message_pdu); 525 } 526 527 static void mesh_upper_transport_send_segmented_access_pdu_ccm(void * arg){ 528 crypto_active = 0; 529 530 mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; 531 mesh_print_hex("EncAccessPayload", transport_pdu->data, transport_pdu->len); 532 // store TransMIC 533 btstack_crypto_ccm_get_authentication_value(&ccm, &transport_pdu->data[transport_pdu->len]); 534 mesh_print_hex("TransMIC", &transport_pdu->data[transport_pdu->len], transport_pdu->transmic_len); 535 transport_pdu->len += transport_pdu->transmic_len; 536 mesh_print_hex("UpperTransportPDU", transport_pdu->data, transport_pdu->len); 537 mesh_upper_transport_send_segmented_pdu(transport_pdu); 538 } 539 540 static uint8_t mesh_upper_transport_setup_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, 541 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 542 543 if (control_pdu_len > 11) return 1; 544 545 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 546 if (!network_key) return 1; 547 548 uint8_t transport_pdu_data[12]; 549 transport_pdu_data[0] = opcode; 550 (void)memcpy(&transport_pdu_data[1], control_pdu_data, control_pdu_len); 551 uint16_t transport_pdu_len = control_pdu_len + 1; 552 553 // setup network_pdu 554 mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, 0, src, dest, transport_pdu_data, transport_pdu_len); 555 556 return 0; 557 } 558 559 static uint8_t mesh_upper_transport_setup_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, 560 const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 561 562 if (control_pdu_len > 256) return 1; 563 564 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 565 if (!network_key) return 1; 566 567 (void)memcpy(transport_pdu->data, control_pdu_data, control_pdu_len); 568 transport_pdu->len = control_pdu_len; 569 transport_pdu->netkey_index = netkey_index; 570 transport_pdu->akf_aid_control = opcode; 571 transport_pdu->transmic_len = 0; // no TransMIC for control 572 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid); 573 mesh_transport_set_src(transport_pdu, src); 574 mesh_transport_set_dest(transport_pdu, dest); 575 mesh_transport_set_ctl_ttl(transport_pdu, 0x80 | ttl); 576 577 return 0; 578 } 579 580 uint8_t mesh_upper_transport_setup_control_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, 581 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t opcode, const uint8_t * control_pdu_data, uint16_t control_pdu_len){ 582 switch (pdu->pdu_type){ 583 case MESH_PDU_TYPE_NETWORK: 584 return mesh_upper_transport_setup_unsegmented_control_pdu((mesh_network_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); 585 case MESH_PDU_TYPE_TRANSPORT: 586 return mesh_upper_transport_setup_segmented_control_pdu((mesh_transport_pdu_t *) pdu, netkey_index, ttl, src, dest, opcode, control_pdu_data, control_pdu_len); 587 case MESH_PDU_TYPE_SEGMENTED: 588 btstack_assert(0); 589 break; 590 default: 591 return 1; 592 } 593 } 594 595 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu_header(mesh_unsegmented_pdu_t * unsegmented_pdu, uint16_t netkey_index, 596 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest){ 597 598 mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; 599 600 // get app or device key 601 const mesh_transport_key_t * appkey; 602 appkey = mesh_transport_key_get(appkey_index); 603 if (appkey == NULL){ 604 printf("appkey_index %x unknown\n", appkey_index); 605 return 1; 606 } 607 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 608 609 // lookup network by netkey_index 610 const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); 611 if (!network_key) return 1; 612 613 unsegmented_pdu->appkey_index = appkey_index; 614 615 network_pdu->data[9] = akf_aid; 616 // setup network_pdu 617 mesh_network_setup_pdu_header(network_pdu, netkey_index, network_key->nid, 0, ttl, 0, src, dest); 618 return 0; 619 } 620 621 static uint8_t mesh_upper_transport_setup_unsegmented_access_pdu(mesh_unsegmented_pdu_t * unsegmented_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, 622 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 623 624 int status = mesh_upper_transport_setup_unsegmented_access_pdu_header(unsegmented_pdu, netkey_index, appkey_index, ttl, src, dest); 625 if (status) return status; 626 627 // store in unsegmented pdu 628 mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; 629 (void)memcpy(&network_pdu->data[10], access_pdu_data, access_pdu_len); 630 network_pdu->len = 10 + access_pdu_len; 631 return 0; 632 } 633 634 static uint8_t mesh_upper_transport_setup_segmented_access_pdu_header(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, 635 uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 636 637 // get app or device key 638 const mesh_transport_key_t *appkey; 639 appkey = mesh_transport_key_get(appkey_index); 640 if (appkey == NULL) { 641 printf("[!] Upper transport, setup segmented Access PDU - appkey_index %x unknown\n", appkey_index); 642 return 1; 643 } 644 uint8_t akf_aid = (appkey->akf << 6) | appkey->aid; 645 646 // lookup network by netkey_index 647 const mesh_network_key_t *network_key = mesh_network_key_list_get(netkey_index); 648 if (!network_key) return 1; 649 if (network_key == NULL) { 650 printf("[!] Upper transport, setup segmented Access PDU - netkey_index %x unknown\n", appkey_index); 651 return 1; 652 } 653 654 const uint8_t trans_mic_len = szmic ? 8 : 4; 655 656 // store in transport pdu 657 transport_pdu->transmic_len = trans_mic_len; 658 transport_pdu->netkey_index = netkey_index; 659 transport_pdu->appkey_index = appkey_index; 660 transport_pdu->akf_aid_control = akf_aid; 661 mesh_transport_set_nid_ivi(transport_pdu, network_key->nid | ((mesh_get_iv_index_for_tx() & 1) << 7)); 662 mesh_transport_set_src(transport_pdu, src); 663 mesh_transport_set_dest(transport_pdu, dest); 664 mesh_transport_set_ctl_ttl(transport_pdu, ttl); 665 return 0; 666 } 667 668 669 static uint8_t mesh_upper_transport_setup_segmented_access_pdu(mesh_transport_pdu_t * transport_pdu, uint16_t netkey_index, uint16_t appkey_index, uint8_t ttl, uint16_t src, uint16_t dest, 670 uint8_t szmic, const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 671 int status = mesh_upper_transport_setup_segmented_access_pdu_header(transport_pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 672 if (status) return status; 673 674 // store in transport pdu 675 (void)memcpy(transport_pdu->data, access_pdu_data, access_pdu_len); 676 transport_pdu->len = access_pdu_len; 677 return 0; 678 } 679 uint8_t mesh_upper_transport_setup_access_pdu_header(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 680 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic){ 681 switch (pdu->pdu_type){ 682 case MESH_PDU_TYPE_TRANSPORT: 683 return mesh_upper_transport_setup_segmented_access_pdu_header((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic); 684 case MESH_PDU_TYPE_UNSEGMENTED: 685 return mesh_upper_transport_setup_unsegmented_access_pdu_header((mesh_unsegmented_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest); 686 default: 687 btstack_assert(false); 688 return 1; 689 } 690 } 691 692 uint8_t mesh_upper_transport_setup_access_pdu(mesh_pdu_t * pdu, uint16_t netkey_index, uint16_t appkey_index, 693 uint8_t ttl, uint16_t src, uint16_t dest, uint8_t szmic, 694 const uint8_t * access_pdu_data, uint8_t access_pdu_len){ 695 switch (pdu->pdu_type){ 696 case MESH_PDU_TYPE_UNSEGMENTED: 697 return mesh_upper_transport_setup_unsegmented_access_pdu((mesh_unsegmented_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, access_pdu_data, access_pdu_len); 698 case MESH_PDU_TYPE_TRANSPORT: 699 return mesh_upper_transport_setup_segmented_access_pdu((mesh_transport_pdu_t *) pdu, netkey_index, appkey_index, ttl, src, dest, szmic, access_pdu_data, access_pdu_len); 700 default: 701 btstack_assert(false); 702 return 1; 703 } 704 } 705 706 static void mesh_upper_transport_send_unsegmented_access_pdu_digest(void * arg){ 707 mesh_unsegmented_pdu_t * unsegmented_pdu = (mesh_unsegmented_pdu_t *) arg; 708 mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; 709 uint8_t * access_pdu_data = mesh_network_pdu_data(network_pdu) + 1; 710 uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 711 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len, access_pdu_data, access_pdu_data, &mesh_upper_transport_send_unsegmented_access_pdu_ccm, unsegmented_pdu); 712 } 713 714 static mesh_transport_key_t * mesh_upper_transport_get_outgoing_appkey(uint16_t netkey_index, uint16_t appkey_index){ 715 // Device Key is fixed 716 if (appkey_index == MESH_DEVICE_KEY_INDEX) { 717 return mesh_transport_key_get(appkey_index); 718 } 719 720 // Get key refresh state from subnet 721 mesh_subnet_t * subnet = mesh_subnet_get_by_netkey_index(netkey_index); 722 if (subnet == NULL) return NULL; 723 724 // identify old and new app keys for given appkey_index 725 mesh_transport_key_t * old_key = NULL; 726 mesh_transport_key_t * new_key = NULL; 727 mesh_transport_key_iterator_t it; 728 mesh_transport_key_iterator_init(&it, netkey_index); 729 while (mesh_transport_key_iterator_has_more(&it)){ 730 mesh_transport_key_t * transport_key = mesh_transport_key_iterator_get_next(&it); 731 if (transport_key->appkey_index != appkey_index) continue; 732 if (transport_key->old_key == 0) { 733 new_key = transport_key; 734 } else { 735 old_key = transport_key; 736 } 737 } 738 739 // if no key is marked as old, just use the current one 740 if (old_key == NULL) return new_key; 741 742 // use new key if it exists in phase two 743 if ((subnet->key_refresh == MESH_KEY_REFRESH_SECOND_PHASE) && (new_key != NULL)){ 744 return new_key; 745 } else { 746 return old_key; 747 } 748 } 749 750 static void mesh_upper_transport_send_unsegmented_access_pdu(mesh_unsegmented_pdu_t * unsegmented_pdu){ 751 752 mesh_network_pdu_t * network_pdu = unsegmented_pdu->segment; 753 754 // if dst is virtual address, lookup label uuid and hash 755 uint16_t aad_len = 0; 756 mesh_virtual_address_t * virtual_address = NULL; 757 uint16_t dst = mesh_network_dst(network_pdu); 758 if (mesh_network_address_virtual(dst)){ 759 virtual_address = mesh_virtual_address_for_pseudo_dst(dst); 760 if (!virtual_address){ 761 printf("No virtual address register for pseudo dst %4x\n", dst); 762 btstack_memory_mesh_network_pdu_free(network_pdu); 763 return; 764 } 765 aad_len = 16; 766 big_endian_store_16(network_pdu->data, 7, virtual_address->hash); 767 } 768 769 // reserve slot 770 mesh_lower_transport_reserve_slot(); 771 772 // Nonce for Access Payload based on Network Sequence number: needs to be fixed now and lower layers need to send packet in right order 773 uint32_t seq = mesh_sequence_number_next(); 774 mesh_network_pdu_set_seq(network_pdu, seq); 775 776 // Dump PDU 777 printf("[+] Upper transport, send unsegmented Access PDU - dest %04x, seq %06x\n", dst, mesh_network_seq(network_pdu)); 778 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 779 780 // setup nonce 781 uint16_t appkey_index = unsegmented_pdu->appkey_index; 782 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 783 transport_unsegmented_setup_device_nonce(application_nonce, network_pdu); 784 } else { 785 transport_unsegmented_setup_application_nonce(application_nonce, network_pdu); 786 } 787 788 // get app or device key 789 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(network_pdu->netkey_index, appkey_index); 790 mesh_print_hex("AppOrDevKey", appkey->key, 16); 791 792 // encrypt ccm 793 uint8_t trans_mic_len = 4; 794 uint16_t access_pdu_len = mesh_network_pdu_len(network_pdu) - 1; 795 crypto_active = 1; 796 797 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, trans_mic_len); 798 if (virtual_address){ 799 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 800 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_unsegmented_access_pdu_digest, unsegmented_pdu); 801 } else { 802 mesh_upper_transport_send_unsegmented_access_pdu_digest(unsegmented_pdu); 803 } 804 } 805 806 static void mesh_upper_transport_send_segmented_access_pdu_digest(void *arg){ 807 mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) arg; 808 uint16_t access_pdu_len = transport_pdu->len; 809 uint8_t * access_pdu_data = transport_pdu->data; 810 btstack_crypto_ccm_encrypt_block(&ccm, access_pdu_len,access_pdu_data, access_pdu_data, &mesh_upper_transport_send_segmented_access_pdu_ccm, transport_pdu); 811 } 812 813 static void mesh_upper_transport_send_segmented_access_pdu(mesh_transport_pdu_t * transport_pdu){ 814 815 // if dst is virtual address, lookup label uuid and hash 816 uint16_t aad_len = 0; 817 mesh_virtual_address_t * virtual_address = NULL; 818 uint16_t dst = mesh_transport_dst(transport_pdu); 819 if (mesh_network_address_virtual(dst)){ 820 virtual_address = mesh_virtual_address_for_pseudo_dst(dst); 821 if (!virtual_address){ 822 printf("No virtual address register for pseudo dst %4x\n", dst); 823 btstack_memory_mesh_transport_pdu_free(transport_pdu); 824 return; 825 } 826 // printf("Using hash %4x with LabelUUID: ", virtual_address->hash); 827 // printf_hexdump(virtual_address->label_uuid, 16); 828 aad_len = 16; 829 big_endian_store_16(transport_pdu->network_header, 7, virtual_address->hash); 830 } 831 832 // get app or device key 833 uint16_t appkey_index = transport_pdu->appkey_index; 834 const mesh_transport_key_t * appkey = mesh_upper_transport_get_outgoing_appkey(transport_pdu->netkey_index, appkey_index); 835 if (appkey == NULL){ 836 printf("AppKey %04x not found, drop message\n", appkey_index); 837 btstack_memory_mesh_transport_pdu_free(transport_pdu); 838 return; 839 } 840 841 // reserve slot 842 mesh_lower_transport_reserve_slot(); 843 844 // reserve one sequence number, which is also used to encrypt access payload 845 uint32_t seq = mesh_sequence_number_next(); 846 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 847 mesh_transport_set_seq(transport_pdu, seq); 848 849 // Dump PDU 850 printf("[+] Upper transport, send segmented Access PDU - dest %04x, seq %06x\n", dst, mesh_transport_seq(transport_pdu)); 851 mesh_print_hex("Access Payload", transport_pdu->data, transport_pdu->len); 852 853 // setup nonce - uses dst, so after pseudo address translation 854 if (appkey_index == MESH_DEVICE_KEY_INDEX){ 855 transport_segmented_setup_device_nonce(application_nonce, (mesh_pdu_t *) transport_pdu); 856 } else { 857 transport_segmented_setup_application_nonce(application_nonce, (mesh_pdu_t *) transport_pdu); 858 } 859 860 // Dump key 861 mesh_print_hex("AppOrDevKey", appkey->key, 16); 862 863 // encrypt ccm 864 uint8_t transmic_len = transport_pdu->transmic_len; 865 uint16_t access_pdu_len = transport_pdu->len; 866 crypto_active = 1; 867 btstack_crypto_ccm_init(&ccm, appkey->key, application_nonce, access_pdu_len, aad_len, transmic_len); 868 if (virtual_address){ 869 mesh_print_hex("LabelUUID", virtual_address->label_uuid, 16); 870 btstack_crypto_ccm_digest(&ccm, virtual_address->label_uuid, 16, &mesh_upper_transport_send_segmented_access_pdu_digest, transport_pdu); 871 } else { 872 mesh_upper_transport_send_segmented_access_pdu_digest(transport_pdu); 873 } 874 } 875 876 static void mesh_upper_transport_send_unsegmented_control_pdu(mesh_network_pdu_t * network_pdu){ 877 // reserve slot 878 mesh_lower_transport_reserve_slot(); 879 // reserve sequence number 880 uint32_t seq = mesh_sequence_number_next(); 881 mesh_network_pdu_set_seq(network_pdu, seq); 882 // Dump PDU 883 uint8_t opcode = network_pdu->data[9]; 884 printf("[+] Upper transport, send unsegmented Control PDU %p - seq %06x opcode %02x\n", network_pdu, seq, opcode); 885 mesh_print_hex("Access Payload", &network_pdu->data[10], network_pdu->len - 10); 886 // wrap into mesh-unsegmented-pdu 887 outgoing_unsegmented_pdu.pdu_header.pdu_type = MESH_PDU_TYPE_UNSEGMENTED; 888 outgoing_unsegmented_pdu.segment = network_pdu; 889 890 // send 891 mesh_lower_transport_send_pdu((mesh_pdu_t *) &outgoing_unsegmented_pdu); 892 } 893 894 static void mesh_upper_transport_send_segmented_control_pdu(mesh_transport_pdu_t * transport_pdu){ 895 // reserve slot 896 mesh_lower_transport_reserve_slot(); 897 // reserve sequence number 898 uint32_t seq = mesh_sequence_number_next(); 899 transport_pdu->flags |= MESH_TRANSPORT_FLAG_SEQ_RESERVED; 900 mesh_transport_set_seq(transport_pdu, seq); 901 // Dump PDU 902 uint8_t opcode = transport_pdu->data[0]; 903 printf("[+] Upper transport, send segmented Control PDU %p - seq %06x opcode %02x\n", transport_pdu, seq, opcode); 904 mesh_print_hex("Access Payload", &transport_pdu->data[1], transport_pdu->len - 1); 905 // send 906 mesh_upper_transport_send_segmented_pdu(transport_pdu); 907 } 908 909 static void mesh_upper_transport_run(void){ 910 911 while(!btstack_linked_list_empty(&upper_transport_incoming)){ 912 913 if (crypto_active) return; 914 915 // peek at next message 916 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_incoming); 917 mesh_network_pdu_t * network_pdu; 918 mesh_transport_pdu_t * transport_pdu; 919 mesh_segmented_pdu_t * message_pdu; 920 mesh_unsegmented_pdu_t * unsegmented_pdu; 921 switch (pdu->pdu_type){ 922 case MESH_PDU_TYPE_UNSEGMENTED: 923 unsegmented_pdu = (mesh_unsegmented_pdu_t *) pdu; 924 network_pdu = unsegmented_pdu->segment; 925 btstack_assert(network_pdu != NULL); 926 // control? 927 if (mesh_network_control(network_pdu)) { 928 incoming_unsegmented_pdu_raw = unsegmented_pdu; 929 (void) btstack_linked_list_pop(&upper_transport_incoming); 930 mesh_upper_unsegmented_control_message_received(unsegmented_pdu); 931 break; 932 } else { 933 934 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 935 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 936 incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; 937 938 incoming_access_pdu_encrypted->netkey_index = network_pdu->netkey_index; 939 incoming_access_pdu_encrypted->transmic_len = 4; 940 941 uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); 942 943 incoming_access_pdu_encrypted->akf_aid_control = lower_transport_pdu[0]; 944 incoming_access_pdu_encrypted->len = network_pdu->len - 10; // 9 header + 1 AID 945 (void)memcpy(incoming_access_pdu_encrypted->data, &lower_transport_pdu[1], incoming_access_pdu_encrypted->len); 946 947 // copy meta data into encrypted pdu buffer 948 (void)memcpy(incoming_access_pdu_encrypted->network_header, network_pdu->data, 9); 949 950 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 951 952 // free mesh message 953 mesh_lower_transport_message_processed_by_higher_layer(pdu); 954 955 // get encoded transport pdu and start processing 956 (void) btstack_linked_list_pop(&upper_transport_incoming); 957 mesh_upper_transport_process_segmented_message(); 958 } 959 break; 960 case MESH_PDU_TYPE_SEGMENTED: 961 message_pdu = (mesh_segmented_pdu_t *) pdu; 962 uint8_t ctl = mesh_message_ctl(message_pdu); 963 if (ctl){ 964 printf("Ignoring Segmented Control Message\n"); 965 (void) btstack_linked_list_pop(&upper_transport_incoming); 966 mesh_lower_transport_message_processed_by_higher_layer(pdu); 967 } else { 968 969 incoming_access_pdu_encrypted = &incoming_access_pdu_encrypted_singleton; 970 incoming_access_pdu_encrypted->pdu_header.pdu_type = MESH_PDU_TYPE_ACCESS; 971 incoming_access_pdu_decrypted = &incoming_access_pdu_decrypted_singleton; 972 973 // flatten segmented message into mesh_transport_pdu_t 974 975 // assemble payload 976 while (message_pdu->segments){ 977 mesh_network_pdu_t * segment = (mesh_network_pdu_t *) btstack_linked_list_pop(&message_pdu->segments); 978 // get segment n 979 uint8_t * lower_transport_pdu = mesh_network_pdu_data(segment); 980 uint8_t seg_o = ( big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; 981 uint8_t * segment_data = &lower_transport_pdu[4]; 982 (void)memcpy(&incoming_access_pdu_encrypted->data[seg_o * 12], segment_data, 12); 983 } 984 985 // copy meta data into encrypted pdu buffer 986 incoming_access_pdu_encrypted->len = message_pdu->len; 987 incoming_access_pdu_encrypted->netkey_index = message_pdu->netkey_index; 988 incoming_access_pdu_encrypted->transmic_len = message_pdu->transmic_len; 989 incoming_access_pdu_encrypted->akf_aid_control = message_pdu->akf_aid_control; 990 (void)memcpy(incoming_access_pdu_encrypted->network_header, message_pdu->network_header, 9); 991 992 mesh_print_hex("Assembled payload", incoming_access_pdu_encrypted->data, incoming_access_pdu_encrypted->len); 993 994 // free mesh message 995 mesh_lower_transport_message_processed_by_higher_layer((mesh_pdu_t *)message_pdu); 996 997 // get encoded transport pdu and start processing 998 (void) btstack_linked_list_pop(&upper_transport_incoming); 999 mesh_upper_transport_process_segmented_message(); 1000 } 1001 break; 1002 default: 1003 btstack_assert(0); 1004 break; 1005 } 1006 } 1007 1008 while (!btstack_linked_list_empty(&upper_transport_outgoing)){ 1009 1010 if (crypto_active) break; 1011 1012 if (outgoing_segmented_pdu != NULL) break; 1013 1014 mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_get_first_item(&upper_transport_outgoing); 1015 if (mesh_lower_transport_can_send_to_dest(mesh_pdu_dst(pdu)) == 0) break; 1016 1017 (void) btstack_linked_list_pop(&upper_transport_outgoing); 1018 1019 if (mesh_pdu_ctl(pdu)){ 1020 switch (pdu->pdu_type){ 1021 case MESH_PDU_TYPE_NETWORK: 1022 mesh_upper_transport_send_unsegmented_control_pdu((mesh_network_pdu_t *) pdu); 1023 break; 1024 case MESH_PDU_TYPE_SEGMENTED: 1025 btstack_assert(0); 1026 break; 1027 case MESH_PDU_TYPE_TRANSPORT: 1028 mesh_upper_transport_send_segmented_control_pdu((mesh_transport_pdu_t *) pdu); 1029 break; 1030 default: 1031 break; 1032 } 1033 } else { 1034 switch (pdu->pdu_type){ 1035 case MESH_PDU_TYPE_NETWORK: 1036 btstack_assert(0); 1037 break; 1038 case MESH_PDU_TYPE_UNSEGMENTED: 1039 mesh_upper_transport_send_unsegmented_access_pdu((mesh_unsegmented_pdu_t *) pdu); 1040 break; 1041 case MESH_PDU_TYPE_TRANSPORT: 1042 mesh_upper_transport_send_segmented_access_pdu((mesh_transport_pdu_t *) pdu); 1043 break; 1044 default: 1045 break; 1046 } 1047 } 1048 } 1049 } 1050 1051 1052 1053 static void mesh_upper_transport_pdu_handler(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu){ 1054 mesh_transport_pdu_t * transport_pdu; 1055 mesh_network_pdu_t * network_pdu; 1056 switch (callback_type){ 1057 case MESH_TRANSPORT_PDU_RECEIVED: 1058 mesh_upper_transport_message_received(pdu); 1059 break; 1060 case MESH_TRANSPORT_PDU_SENT: 1061 switch (pdu->pdu_type){ 1062 case MESH_PDU_TYPE_SEGMENTED: 1063 // free chunks 1064 while (!btstack_linked_list_empty(&outgoing_segmented_message_singleton.segments)){ 1065 mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&outgoing_segmented_message_singleton.segments); 1066 mesh_network_pdu_free(network_pdu); 1067 } 1068 // notify upper layer but use transport pdu 1069 transport_pdu = (mesh_transport_pdu_t *) outgoing_segmented_pdu; 1070 outgoing_segmented_pdu = NULL; 1071 if (higher_layer_handler){ 1072 higher_layer_handler(callback_type, status, (mesh_pdu_t*) transport_pdu); 1073 } else { 1074 mesh_transport_pdu_free(transport_pdu); 1075 } 1076 break; 1077 case MESH_PDU_TYPE_UNSEGMENTED: 1078 // notify upper layer but use network pdu 1079 network_pdu = outgoing_unsegmented_pdu.segment; 1080 outgoing_unsegmented_pdu.segment = NULL; 1081 if (higher_layer_handler){ 1082 higher_layer_handler(callback_type, status, (mesh_pdu_t*) network_pdu); 1083 } else { 1084 mesh_network_pdu_free(network_pdu); 1085 } 1086 break; 1087 default: 1088 btstack_assert(false); 1089 break; 1090 } 1091 mesh_upper_transport_run(); 1092 break; 1093 default: 1094 break; 1095 } 1096 } 1097 1098 void mesh_upper_transport_pdu_free(mesh_pdu_t * pdu){ 1099 mesh_network_pdu_t * network_pdu; 1100 mesh_transport_pdu_t * transport_pdu; 1101 mesh_segmented_pdu_t * message_pdu; 1102 switch (pdu->pdu_type) { 1103 case MESH_PDU_TYPE_NETWORK: 1104 network_pdu = (mesh_network_pdu_t *) pdu; 1105 mesh_network_pdu_free(network_pdu); 1106 break; 1107 case MESH_PDU_TYPE_TRANSPORT: 1108 transport_pdu = (mesh_transport_pdu_t *) pdu; 1109 mesh_transport_pdu_free(transport_pdu); 1110 break; 1111 case MESH_PDU_TYPE_SEGMENTED: 1112 message_pdu = (mesh_segmented_pdu_t *) pdu; 1113 mesh_message_pdu_free(message_pdu); 1114 default: 1115 break; 1116 } 1117 } 1118 1119 void mesh_upper_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ 1120 crypto_active = 0; 1121 switch (pdu->pdu_type){ 1122 case MESH_PDU_TYPE_ACCESS: 1123 mesh_upper_transport_process_segmented_access_message_done((mesh_access_pdu_t *) pdu); 1124 break; 1125 case MESH_PDU_TYPE_SEGMENTED: 1126 mesh_upper_transport_process_message_done((mesh_segmented_pdu_t *) pdu); 1127 break; 1128 case MESH_PDU_TYPE_UNSEGMENTED: 1129 mesh_upper_transport_process_unsegmented_message_done(pdu); 1130 break; 1131 default: 1132 btstack_assert(0); 1133 break; 1134 } 1135 } 1136 1137 void mesh_upper_transport_register_access_message_handler(void (*callback)(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu)) { 1138 mesh_access_message_handler = callback; 1139 } 1140 1141 void mesh_upper_transport_register_control_message_handler(void (*callback)(mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu)){ 1142 mesh_control_message_handler = callback; 1143 } 1144 1145 void mesh_upper_transport_set_higher_layer_handler(void (*pdu_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu)){ 1146 higher_layer_handler = pdu_handler; 1147 } 1148 1149 void mesh_upper_transport_init(){ 1150 mesh_lower_transport_set_higher_layer_handler(&mesh_upper_transport_pdu_handler); 1151 } 1152